What Causes Excessive Body Vibration?
1 Answers
Your vehicle may be experiencing the following conditions: 1. Severe engine carbon buildup: The most common cause of car vibration is a dirty throttle body or excessive carbon deposits in the fuel injectors. When there's too much carbon buildup inside the engine, the gasoline sprayed by the cold-start injector gets largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts. This makes the vehicle difficult to start—only when the carbon deposits become saturated with gasoline does the engine start more easily. After starting, the gasoline adsorbed on the carbon deposits gets drawn into the combustion chamber by the engine's vacuum, making the mixture too rich. This fluctuation between lean and rich mixtures causes idle vibration after cold starts. The lower the temperature, the more fuel is needed for cold starts, and carbon deposits significantly affect whether cold starts proceed smoothly. 2. Ignition system issues: Check the condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance in the ignition system or weak sparking from the spark plugs can also lead to such symptoms. 3. Unstable fuel pressure: If you've already cleaned the engine carbon deposits, throttle body, replaced gaskets and spark plugs, but still notice body vibration at idle, it's recommended to visit a 4S shop to check the fuel supply pressure and the intake pressure sensor. Abnormal fuel pump pressure or incorrect readings/malfunctioning of the intake pressure sensor can both cause body vibration. 4. Aging engine components: Car vibration can also be related to worn engine mounts. Engine mounts act as the engine's shock absorption system, absorbing minor vibrations during operation. If the engine mounts are faulty, these vibrations can transfer to the steering wheel and cabin, causing noticeable shaking at idle.
